His personality could become more complex. As a god, he'd have to deal with politics among the divine beings. This might make him more calculating and strategic. But his core values of loyalty and friendship would still be there. He'd just have to balance them with his new responsibilities. For example, he might have to make tough decisions that go against his personal feelings to maintain the balance among the gods.
He might become more aloof. Being a god often comes with a sense of superiority, but Percy has always been down - to - earth. However, his new status could make him a bit more distant from his mortal friends at first. But deep down, he'd still be the same Percy with a strong sense of right and wrong.
Well, initially, Percy might be really confused about his new personality. He's used to being a scrappy demigod. But as a god, he could become more calculating. He'd have to think about the long - term consequences of his actions more. His loyalty to his friends might be tested as he has to consider the greater good of the world. He might also become more secretive as he has to deal with godly secrets and politics. He would still have his core of kindness, but it might be overshadowed at times by his new godly traits.
He might become more patient. Since he has control over time, he would understand the concept of waiting better. For example, he wouldn't be as impulsive as before when facing challenges.
He might become more war - like. Norse gods are often associated with battle, so Percy could lose some of his more laid - back Greek side.
His sense of humor might change. He could become more wry and god - like in his jokes. Also, he might be more decisive, as a god has to make big decisions quickly. However, his love for his friends and family would still be there, just expressed in a different way perhaps, more like a distant protector.
His sense of humor might change. While Percy had a very down - to - earth and sarcastic humor as a mortal, as a god, he might develop a more refined and sometimes cutting sense of humor. He could use it to put other gods in their place or to make a point during a council meeting. Also, he would likely become more confident, bordering on arrogance at times. His new powers and status would give him a boost in self - assurance, but his friends from his mortal days would probably be the ones to keep him in check and remind him not to get too full of himself.
His sense of humor might change. While he was always quick - witted as a demigod, as a god, his humor could become more refined or perhaps more sarcastic in a way that only the other gods would understand. He'd be around different company, and that would influence how he expresses himself. Also, he could become more confident, bordering on arrogant, as he has so much power at his disposal now. But at the same time, his core values of loyalty and protecting the weak might still remain, just expressed in different ways.
His confidence would likely soar. As a god, he'd know he has more power and capabilities. So he might be more assertive in his actions and decisions.
He might become more assertive and decisive. Normally, Percy is a bit of a reluctant hero, but as a gang leader, he'd have to make quick decisions to protect his gang. He could also become more secretive, as gang activities often need to be kept under wraps.
If Percy joins the Volturi in fanfiction, his personality could change in multiple ways. At first, he might be very resistant to their ways. But as time passes, he could become more like them in some aspects. He would be surrounded by vampires who are mainly concerned with power and control. This could make him more power - hungry. But also, Percy has a strong sense of justice. So, he might try to use the Volturi's power structure to enforce his own sense of right and wrong. This could lead to him being more authoritarian in his approach. He might also become more isolated as he can't fully trust the other Volturi members, which could make him more withdrawn and less likely to show his true emotions.
He might become more aloof. As a goddess, he'd be in a different social strata than before. He'd be more removed from the daily struggles of demigods and mortals, which could make him seem less approachable.